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STMicroelectronics STF8N90K5 — Discrete Semiconductors

STF8N90K5 N-Channel MOSFET, 900 V, 8 A, TO-220FP

MPNSTF8N90K5
Active

STMicroelectronics MDmesh™ K5 series STF8N90K5, N-Channel MOSFET, 900 V drain-source, 8 A continuous drain current at 25°C, 130 W power dissipation, TO-220-3 Full Pack through-hole package, -55°C to 150°C junction temperature.

$3.1600Ref. price · indicative, final on quote
STMicroelectronics STF8N90K5 datasheet (PDF)
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

STF8N90K5 specifications
ParameterValue
SeriesMDmesh™ K5
FET typeN-Channel
MountingThrough Hole
Drain to source voltage900 V
Drive voltage (Max rds on, min rds on)10V
Current - continuous drain (Id) @ 25°C8A (Tc)
Power dissipation130W (Tc)
Operating temperature-55°C ~ 150°C (TJ)
PackageTube
Vgs±30V
TechnologyMOSFET (Metal Oxide)
CaseTO-220-3 Full Pack
Vgs(th) (Max) @ id5V @ 100µA

Product details

The STF8N90K5: The 900 V drain-to-source rating gives you a solid derating margin for universal-input offline designs that see transient spikes up to 800 V or more. That saves assembly time and improves thermal transfer in a crowded chassis.

Temperature range and gate threshold — the bench reality

Maximum gate threshold voltage is 5 V at 100 µA drain current. 10 V gate drive needed for lowest Rds(on). ±30 V maximum gate-source rating.

Active lifecycle. 900 V drain-source. 8 A continuous drain current.

Frequently asked questions

What is the Vgs threshold of the STF8N90K5?

The maximum gate threshold voltage is 5 V at a drain current of 100 µA. This is a standard threshold for a 10 V gate-drive part — do not expect it to turn on fully with a 5 V logic signal.

What is the maximum power dissipation of the STF8N90K5?

The maximum power dissipation is 130 W at the case temperature (Tc). That figure assumes the case is held at 25°C — in practice, derate based on your heatsink and ambient temperature.

What is the difference between the STF8N90K5 and the STF8N80K5?

The primary difference is the drain-to-source voltage rating: the STF8N90K5 is rated for 900 V, while the STF8N80K5 is an 800 V part. Both are in the same MDmesh K5 family and share the same TO-220FP package and pinout, so they are footprint-compatible. Choose the 900 V version when you need extra voltage margin for universal-input designs or applications with high transient spikes.